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Title:
The 2dF Galaxy Redshift Survey: the number and luminosity density of galaxies
Authors:
Cross, Nicholas; Driver, Simon P.; Couch, Warrick; Baugh, Carlton M.; Bland-Hawthorn, Joss; Bridges, Terry; Cannon, Russell; Cole, Shaun; Colless, Matthew; Collins, Chris; Dalton, Gavin; Deeley, Kathryn; De Propris, Roberto; Efstathiou, George; Ellis, Richard S.; Frenk, Carlos S.; Glazebrook, Karl; Jackson, Carole; Lahav, Ofer; Lewis, Ian; Lumsden, Stuart; Maddox, Steve; Madgwick, Darren; Moody, Stephen; Norberg, Peder; Peacock, John A.; Peterson, Bruce A.; Price, Ian; Seaborne, Mark; Sutherland, Will; Tadros, Helen; Taylor, Keith
Affiliation:
AA(School of Physics and Astronomy, North Haugh, St Andrews, Fife KY16 9SS ), AB(School of Physics and Astronomy, North Haugh, St Andrews, Fife KY16 9SS ), AC(Department of Astrophysics, University of New South Wales, Sydney, NSW 2052, Australia ), AD(Department of Physics, South Road, Durham DH1 3LE ), AE(Anglo-Australian Observatory, PO Box 296, Epping, NSW 2121, Australia ), AF(Anglo-Australian Observatory, PO Box 296, Epping, NSW 2121, Australia ), AG(Anglo-Australian Observatory, PO Box 296, Epping, NSW 2121, Australia ), AH(Department of Physics, South Road, Durham DH1 3LE ), AI(Research School of Astronomy and Astrophysics, The Australian National University, Weston Creek, ACT 2611, Australia ), AJ(Astrophysics Research Institute, Liverpool John Moores University, Twelve Quays House, Egerton Wharf, Birkenhead L14 1LD ), AK(Department of Physics, Keble Road, Oxford OX1 3RH ), AL(Department of Astrophysics, University of New South Wales, Sydney, NSW 2052, Australia ), AM(Department of Astrophysics, University of New South Wales, Sydney, NSW 2052, Australia ), AN(Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA ), AO(Department of Astronomy, 105-24, California Institute of Technology, Pasadena, CA 91125, USA ), AP(Department of Physics, South Road, Durham DH1 3LE ), AQ(Department of Physics and Astronomy, John Hopkins University, Baltimore, MD 21218, USA ), AR(Research School of Astronomy and Astrophysics, The Australian National University, Weston Creek, ACT 2611, Australia ), AS(Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA ), AT(Anglo-Australian Observatory, PO Box 296, Epping, NSW 2121, Australia ), AU(Department of Physics and Astronomy, E. C. Stoner Building, Leeds LS2 9JT ), AV(School of Physics and Astronomy, University of Nottingham, University Park, Nottingham NG7 2RD ), AW(Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA ), AX(Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA ), AY(Department of Physics, South Road, Durham DH1 3LE ), AZ(Institute of Astronomy, University of Edinburgh, Royal Observatory, Edinburgh EH9 3HJ), BA(Research School of Astronomy and Astrophysics, The Australian National University, Weston Creek, ACT 2611, Australia ), BB(Research School of Astronomy and Astrophysics, The Australian National University, Weston Creek, ACT 2611, Australia ), BC(Department of Physics, Keble Road, Oxford OX1 3RH ), BD(Institute of Astronomy, University of Edinburgh, Royal Observatory, Edinburgh EH9 3HJ), BE(Department of Physics, Keble Road, Oxford OX1 3RH ), BF(Anglo-Australian Observatory, PO Box 296, Epping, NSW 2121, Australia )
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 324, Issue 4, pp. 825-841. (MNRAS Homepage)
Publication Date:
07/2001
Origin:
MNRAS
MNRAS Keywords:
SURVEYS, GALAXIES: DISTANCES AND REDSHIFTS, GALAXIES: GENERAL, GALAXIES: LUMINOSITY FUNCTION, MASS FUNCTION
DOI:
10.1046/j.1365-8711.2001.04254.x
Bibliographic Code:
2001MNRAS.324..825C

Abstract

We present the bivariate brightness distribution (BBD) for the 2dF Galaxy Redshift Survey (2dFGRS) based on a preliminary subsample of 45000 galaxies. The BBD is an extension of the galaxy luminosity function, incorporating surface brightness information. It allows the measurement of the local luminosity density, jB, and of the galaxy luminosity and surface brightness distributions, while accounting for surface brightness selection biases. The recovered 2dFGRS BBD shows a strong luminosity-surface brightness relation MB~(2.4+/-0.51.5)μe], providing a new constraint for galaxy formation models. In terms of the number density, we find that the peak of the galaxy population lies at MB>=-16.0mag. Within the well-defined selection limits (-24<MB<-16.0mag, 18.0<μe<24.5mag arcsec-2) the contribution towards the luminosity density is dominated by conventional giant galaxies (i.e., 90 per cent of the luminosity density is contained within -22.5<M<-17.5, 18.0<μe<23.0). The luminosity-density peak lies away from the selection boundaries, implying that the 2dFGRS is complete in terms of sampling the local luminosity density, and that luminous low surface brightness galaxies are rare. The final value we derive for the local luminosity density, inclusive of surface brightness corrections, is jB=2.49+/- 0.20×108h100LsolarMpc- 3. Representative Schechter function parameters are M*=-19.75+/-0.05, φ*=2.02+/-0.02×10-2 and α=-1.09+/-0.03. Finally, we note that extending the conventional methodology to incorporate surface brightness selection effects has resulted in an increase in the luminosity density of ~37 per cent. Hence surface brightness selection effects would appear to explain much of the discrepancy between previous estimates of the local luminosity density.

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